Diagnostic Aids

WARNING: This page is about a different car, the 2002 Oldsmobile Bravada, 2002 GMC Envoy XL, 2002 GMC Envoy, and 2002 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.

Ensure that the fuel level is in the same range as the customer concern.
For intermittent diagnosis, refer to TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS in Wiring Systems.
Refer to Fuel Level Specifications in order to verify the correct fuel level sensor readings. The Fuel Level (%) parameter is available on the scan tool in the PCM data list.